The body arginine to make nitric oxide, a substance that relaxes the blood vessels. Arginine has been proposed as a treatment for various cardiovascular diseases, including congestive heart failure and intermittent claudication, as well as impotence, female sexual dysfunction, and interstitial cystitis. Arginine's potential effects on immunity have also created an interest when used to prevent colds. Studies suggest that arginine might be helpful for the treatment of several seemingly unrelated conditions that are, in fact, all linked by arginine's effects on nitric oxide: congestive heart failure, intermittent claudication, angina, impotence and sexual dysfunction in women.

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